Created
April 10, 2018 13:42
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S_Dbw_part2.py
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def density(self,density_list=[]): | |
""" | |
compute the density of one or two cluster(depend on density_list) | |
变量 density_list 将作为此函数的内部列表,其取值范围是0,1,2,... ,元素个数是聚类类别数目 | |
""" | |
density = 0 | |
if len(density_list) == 2: # 当考虑两个聚类类别时候,给出中心点位置 | |
center_v = (self.cluster_centroids_[density_list[0]] +self.cluster_centroids_[density_list[1]])/2 | |
else: # 当只考虑某一个聚类类别的时候,给出中心点位置 | |
center_v = self.cluster_centroids_[density_list[0]] | |
for i in density_list: | |
temp = self.data[self.data_cluster == i] | |
for j in temp: # np.linalg.norm 是求范数(order=2) | |
if np.linalg.norm(j - center_v) <= self.stdev: | |
density += 1 | |
return density |
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